Adjustable folding scaffold



April 18, 1933. c. VAN HORN ADJUSTABLE FOLDING S GAFFOLD 2 Sheeils-Sheet 1 Filed April 27, 1932 Cansfanz" Van .Hww.

April 18, 1933. C. VAN HORN 1,904,808

ADJUSTABLE FOLDING SCAFFOLD Filed April 2 7, 1932 2 Shee'ts-She'et 2 on the line 3-3 of Figure 2,

Patented Apr. 18, 1933 i ibonsrm ivunnonn, orsEnTrrmn-am'ruin 1 j ADJUSTABLE Forpmqsggse is a Application filed April 27;1'93a. fstiial This invention relates to a scaffold primarily adapted'to be constructed of metal and to be of the foldin as well as adjustable.

It is particularly aimed to provide a structure in which the brace means for the horizontal supporting bar are novel vertical elements. 1

The more specific objects and advantages perable with -Will become apparent from a consideration of the description following taken inconnection with accompanying drawings, i1- lustrating an operativeembodiment. a In said drawings'z V Figure 1 is an end elevation of the scafold, a t

Figure 2 is a side elevation of half-of the scaffold,

Figure 3 is a vertical sectio nal view taken Figure 4 is a horizontal sectional View taken on the line 4-4 of Figure 1,

Figure 5 is a horizontal sectional view taken on the line 5-5 of Figure 1,

rmin) on the line 6-6 of Figure 1, and

Figure 7 is a vertical sectional view taken,

on the line 77 of Figure 2. V r The scaifold has a, supporting device'A -at each end thereof, one of suchdevices alone being shown since the other is a duplicate thereof. Such supporting device comprises diagonally disposed legs 10 of angle or equivalent construction connected at the top 735 by breast plates 11 and bolts 12 removably ,and detachably passed therethrough, the lowermost bolts 12 having nuts 13 equipped with integral handles 14 so that they may be quickly applied'or removed. A central vX69 leg or upright 15 is secured between the breast'plates 11 and a cross bar 16 crosses the legs 10 and 15, and is removable therefrom so that in the absence of the lower bolts 12 the bar 16 may be removed and the legs. 10 swung into vparallelism with the leg 15. A bolt 17 detachably connectsthe cross bar 16 to the leg 15 and bolts 18 detachably connect the cross bar tothe legs 10, the nuts 19 therefor preferably having handles 20 integral therewith. V A supporting bar 21 is"g g or knock-down type? a 1 Br-sees 34 en Figure 6 is a vertical sectional view taken I regime. l I

vertically djus'table in the *cha -leg 15, having rack teeth as th-"th'e teeth "f;a%p'inion 2 F shaft} '24 ouin-aled' i in t1 Zf wliich an' operating ha dl P fa'st'ene'd. Said shaft 24 I stageksupporting bar SOmfay Be dtaehably" ma er-wedges:and connected to the tars- 21,

e providedfbetwe tangle or claihp bolt'si"38- and coacting nuts 9- ltherefor e preferably provided with hanc 40: It will be r1oted -that, the bra-TieS 34 ar-cf offian'gleform in I cross section is charm fiw hen *the device is "dis-assembledeand -pactly posed with-iii the"? space #or angle-i 1'1 various changes may be re'sortedto prov-idedf they*fall 'within tires of the appended claims. i What 1" claim as -my inventien rib "d; comprise breas't pl ate :1 1; as deviceo'f the class desc ing angul arly isposed' legs, *c onrie sting f the ring aIl ofthe'saidlegs; said verti'ca leg be- V i ing ofwchannel form,ilafili ftingiibdr lidable inothe rchannelriof 5th e; lastarireiitionfiiuleg sand -provided iawithcrack: teethfla ipmiom lmnies'h g gwith iflthe irack :rteeth, a; shaft: j ournaled 1 on mthe= breast; platenmountingiisa-id ifpinio n, ea sratchtrwheel:onesaideshaft, reacting-With said natchetrwheel l I i2.-Aide .ieeilof.itheacIaSsJdescribe ;1,904,ses-

pairs of th ef-supporting"?devices ndwe 32, havis ewf achm'entiebeihg had with therma -hymns 3 pinit" and seopef legs, werueal iegi between l the first nrentroned legs,across bar connectprising angularly disposed legs, a breast plate pivotally mounting the legs, driven fastenings engaging the legs and breast plate and holding them angularly disposed, said fastenings being removable whereby the legs mayo-be moved into folded position, a

tical leg between the first mentioned legs,'a cross bar. connecting all ofsaid legs, said vertical leg being of channel form, a lifting bar slidable in the channel of the last mentioned leg and provided with rack teeth, a pinion in mesh with the rack teeth, ashaft V 'journaled on the breast plate mounting said pinion, a ratchet wheelon said shaft, and a pawl coacting with said ratchet wheel.

, 3'. A devicevof theclass described com-.

- wheel on said shaft, a pawl coacting with, said ratchet wheel, said lifting bar being prising angularly disposed legs, a breast plate connecting the legs, a vertical leg between the first mentioned legs, a cross bar connecting all of said legs, said vertical leg CONSTANT VANHORN.

being of channel form, a lifting bar slidable inthe channel of the last'mentioned legvand provided with rack teeth, a pinion inmesh with the rack teeth, a shaft journaled on the a breast plate mounting said pinion, a ratchet provided ,with means to secure it tOf ascaffold. stage-supporting element, a brace pivotally connected to the lifting bar, and;-

means on the, brace for connection to the element supported by the lifting bar. I

4. A device of the class described comprising abreast plate, diagonal .legs'pivoted thereto, fastenings engaging the legs and breast plate and preventing pivotal movement of the legs, a channel leg intermediate the first mentioned legs, a bar pivoted to the channel leg and detachablyconnected to the first mentionedlegs, a lifting bar operable in the channel of the channel legandprovided-with rack teeth,.a pinion engaging I v coacting with the ratchet wheel, said lifting ,saidrack teeth, ashaft on the breast plate to which the pinion is keyed, aratchet wheel I on saidshaft, a pawl onsaid breast plate bar being provided with means to secure it to .-a -scaffold stage supporting element, and

a brace pivotally connected to .the lifting I bar and engageable with the same element as the lifting bar.

5. A device of the-class described compris- 1 ing a breast plate, diagonal legs pivoted -thereto, fastenings engaging the legs and breast plate and preventing pivotal movement of the legs, a channel legintermediate the first mentioned legs, a bar pivoted to the channel leg and detachably connected to the .firstmentionedlegs, a lifting bar operable 60.

in the channel of the channel leg and provided .with rack teeth, a pinion engaging said rack teeth, a shaft on the breast plate to which the pinion is keyed, a ratchet wheel on said shaft,'a pawl on said breastplate ,coacting with the ratchet wheel, said lifting 1 I 

